The real world is much more confounding than any QA team can test for. When you launch a huge population of products, even “small” effected populations can number in the thousands.
Additionally, hardware products are just freaking difficult. Decisions and compromises are made all the way from concept to shipping. The consequences of those choices and how they interact or compound are very, very difficult to predict, track, or understand. Yet, these companies have to meet real deadlines set by suppliers, shoppers, and a thousand other processes not in their control.
Many very component companies still come down to making a gamble and game time call when they make the final decision to ship and put the product in the hands of the consumer. There’s just almost no way around it.
This is why Samsung can release a phone with battery problems or a folding phone with flaws. Or Apple can release a phone with antenna or PC with cooling issues or keyboard jams. Or Boeing can release a buggy tail control system that downs planes.
Every major manufacturer lives it. The best just do everything in their power, their culture, and belief system to tame it.